[clang] [clang][Sema] fix crash on __type_pack_element with dependent packs (GH180307) (PR #180407)

[via cfe-commits]

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@@ -3406,6 +3406,10 @@ static QualType checkBuiltinTemplateIdType(
     Sema &SemaRef, ElaboratedTypeKeyword Keyword, BuiltinTemplateDecl *BTD,
     ArrayRef<TemplateArgument> Converted, SourceLocation TemplateLoc,
     TemplateArgumentListInfo &TemplateArgs) {
+  if (llvm::any_of(Converted,
+                   [](const TemplateArgument &A) { return A.isDependent(); }))
+    return QualType();
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Serosh-commits wrote:

> __make_integer_seq seems to tolerate dependent types, so it seems this change is too aggressive?

nice i was thinking that too @cor3ntin the global check was definitely too aggressive. i have  moved the dependency checks into the cases and limited the __make_integer_seq check to just the sequence length. this keeps the eager expansion working for dependent templates and types and i also have added a test case to verify this specifically let me know if it is right 

https://github.com/llvm/llvm-project/pull/180407